(19)

(11)

EP 0 038 853 A1

(12)

(43) Date of publication: 04.11.1981 Bulletin 1981/44 (21) Application number: 80902345.0 (22) Date of filing: 30.10.1980

(51) International Patent Classification (IPC):  B02C 17/ 14( . ) B22C 5/ 04( . ) B02C 19/ 16( . ) B22C 5/ 10( . ) (86) International application number: PCT/US1980/001454 (87) International publication number: WO 1981/001252 (14.05.1981 Gazette 1981/12)

(84) Designated Contracting States: DE FR GB (30) Priority: 31.10.1979 US 19790090028 (71) Applicant: THE CARBORUNDUM COMPANY Niagara Falls, New York 14302 (US)	(72) Inventors: BOWLING, Joseph Edward, Jr. Waynesboro, PA 17268 (US) CARPENTER, James Hugh Hagerstown, MD 2174 (US) ROWE, Russell Lowry Hagerstown, MD 21740 (US) (74) Representative: Mock, Hans, et al  MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)